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2004 volkswagen golf check engine light



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There has been a lot of posts in the last fw months about codes and reseting the computers without paying VW $60 to do it. well for the DIY here is a home remedy, unfortunatley this does not allow you to read the codes but however it does allow you to reset teh computer to the same position as if the dealer would.

I learned this procedure from a very reliable source at VWOA. 8)

1) remove both the Positive and teh negative battery terminals from the battery.

2) Wait 15 seconds then touch the 2 removed battery leads together and hold for 10 seconds then seperate. (This immatated the same capicitor discharge that is involved with the Vagcom reset)

3) replace and reattach the terminals to the battery

4) stick key in ignition and turn to ignition on (DO NOT START THE CAR) and leave in this position for 30 seconds to allow the newely reset computer to re-learn the parts of your vehicle.

5) Enjoy not having a check engine light staring you in your face.

I have done this procedure countless times now during the rebuild, changing and modification process of my motor, trans and turbo and saved me a lot of time and headaches. wink:

A little-known extra step in this procedure is that the driver's door must be open during the "ignition on" step. Since the door usually remains open to make it easier to hop in and out of the car during this procedure, almost everyone manages to perform the procedure without having to consider that point.

But, if you've not been able to get this procedure to work, you might want to see if you been leaving the door open. VW wrote the code this way so resets wouldn't happen during normal operations with the door closed.

if you have specific information from VW regarding that part of the procedure please share it. Otherwise, the whole door open thing is probably an urban legend. FWIW, I never once heard it mentioned on Audiworld.

In the "B5 garage" there is a recent discussion on throttle body alignment/adaption:

Gonna give this a shot tongith as I have a CEL holding me back from smog.

Gonna give this a shot tongith as I have a CEL holding me back from smog.

If CA scans for readiness, you will still fail since I doubt this can set the readiness bits to pass.